Restructuring Charges (Summary of Restructuring Activity) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning Balance			$ 1,550,000
Costs incurred	$ 923,000	$ (36,000)	18,724,000	$ 229,000
Cash disbursements			(16,871,000)
Asset impairment			(762,000)
Translation adjustments and other			359,000
Ending Balance	3,000,000		3,000,000
Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			107,000
Costs incurred			2,426,000
Cash disbursements			(1,194,000)
Asset impairment			(762,000)
Translation adjustments and other			24,000
Ending Balance	601,000		601,000
Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			1,443,000
Costs incurred			16,298,000
Cash disbursements			(15,677,000)
Asset impairment			0
Translation adjustments and other			335,000
Ending Balance	2,399,000		2,399,000
2017 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Costs incurred	900,000		18,632,000
Cash disbursements			(15,558,000)
Asset impairment			(762,000)
Translation adjustments and other			359,000
Ending Balance	2,671,000		2,671,000
2017 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Costs incurred			2,334,000
Cash disbursements			(1,015,000)
Asset impairment			(762,000)
Translation adjustments and other			24,000
Ending Balance	581,000		581,000
2017 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Costs incurred			16,298,000
Cash disbursements			(14,543,000)
Asset impairment			0
Translation adjustments and other			335,000
Ending Balance	2,090,000		2,090,000
2016 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			1,415,000
Costs incurred	0		0
Cash disbursements			(1,114,000)
Ending Balance	301,000		301,000
2016 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Cash disbursements			0
Ending Balance	0		0
2016 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			1,415,000
Cash disbursements			(1,114,000)
Ending Balance	$ 301,000		$ 301,000